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Possible Supernova and Cataclysmic Variable discovered by MASTER

ATel #6317; V. Shumkov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 16 Jul 2014; 15:00 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

Referred to by ATel #: 6325

MASTER OT J170057.81+393421.7 - possible Supernova

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 17h 00m 57.81s +39d 34m 21.7s on 2014-07-11.67365 UT. The OT unfiltered magnitude is 17.8m (limit 19.3m). The OT is seen in 9 images. There is no minor planet at this place. We have reference image without OT on 2011-05-11.75124 UT with unfiltered magnitude limit 19.8m. Sum of twelve MASTER-Tunka images on 2014 July 11.68-11.71 UT with 60-sec exposures is uploaded to http://master.sai.msu.ru/static/OT/J170057+393421-MASTER-Tunka.jpg

The new object is located 28" west and 24" north of the center of galaxy PGC 59437 = Z 225-25 = MCG+07-35-015 = SDSS J170100.31+393357.8 (g=14.38 r=13.52 i=13.09) with z=0.0342. MCG+07-35-015 is the largest member of a group of several galaxies. Spectral confirmation is required. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/170057.81393421.7.jpg

MASTER OT J193347.47+442455.5 - new CV in Kepler field

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 33m 47.47s +44d 24m 55.5s on 2014-07-11.88514 UT. The OT unfiltered magnitude is 16.3m (limit 18.4m). The OT is seen in 12 images. There is no minor planet at this place. We have reference image without OT on 2012-08-25.79287 UT with unfiltered magnitude limit 19.5m.

The OT at quiescence is identical to the blue star USNO-B1.0 1344-0350888 (19 33 47.462 +44 24 56.13 R1=19.50 B2=20.22). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J193347+442455-BRIR5x5.jpg (2x zoom). There is also an UV counterpart GALEX J193347.4+442455 (NUV=22.10+/-0.24). The object is included into Kepler Input Catalog as KIC 8435016. There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Cygnus is not covered by SDSS, CRTS and NEAT.

Based on the blue color and amplitude of variability (~5m), MASTER OT J193347.47+442455.5 is a new cataclysmic variable (dwarf nova in outburst). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/193347.47442455.5.jpg

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net